﻿    <p>
      The <em>IfcPreDefinedProperties</em> is an abstract supertype
      of all predefined property collections that have explicit
      attributes, each representing a property. Instantiable
      subtypes are assigned to specific characterised entities.
    </p>
    <blockquote class="history">
      HISTORY&nbsp; New entity in IFC4.
    </blockquote>